Storage Capacitor, Display Device Using the Same and Method for Manufacturing the Same

• US 20200133083A1
• Filed: 10/16/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: CHUN, Dae-Woong, KIM, Woo-Sang
• Granted Patent: US 11,092,863 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Disclosed are a storage capacitor, a display device in which the storage capacitor is applied to a gate driver embedded in a substrate and a method for manufacturing the same. Reliability of the display device is improved through change in the configuration of the storage capacitor in the gate driver.

Claims

1. A storage capacitor comprising:

a plurality of divided metal patterns formed of a first metal layer on a substrate and spaced apart from one another;

a first electrode connection pattern formed of a second metal layer, the first electrode connection pattern configured to overlap the plurality of divided metal patterns with a buffer layer interposed therebetween and having first connection parts provided in regions between the plurality of divided metal patterns; and

a transparent electrode connection pattern configured to overlap the first electrode connection pattern with an interlayer insulating film interposed therebetween, the transparent electrode connection pattern formed of a transparent electrode and having second connection parts provided in regions between the plurality of divided metal patterns non-overlapping the first connection parts.

2. The storage capacitor according to claim 1, further comprising first electrode contact patterns formed of the second metal layer to be spaced apart from the first electrode connection pattern, each of the first electrode contact patterns configured to overlap at least two adjacent divided metal patterns.

3. The storage capacitor according to claim 2, wherein the transparent electrode connection pattern overlaps the first electrode contact patterns.

4. The storage capacitor according to claim 2, wherein the first electrode contact patterns pass between the at least two adjacent divided metal patterns.

5. The storage capacitor according to claim 1, wherein at least one of the first connection parts and the second connection parts are used for laser cutting parts in a repair process.

6. The storage capacitor according to claim 4, wherein a divided metal pattern of the at least two adjacent divided metal patterns is connected to the first electrode contact patterns.

7. The storage capacitor according to claim 6, wherein the transparent electrode connection pattern is connected to the first electrode contact patterns.

8. A display device comprising:

a substrate having an active area having a plurality of subpixels provided therein and a non-display area outside the active area;

a plurality of first lines and a plurality of second lines provided in the active area to intersect each other; and

a storage capacitor comprising;

a plurality of divided metal patterns formed of a first metal layer, the plurality of divided metal patterns provided on at least one side of the non-display area to be respectively conductively connected to the plurality of first lines and spaced apart from one another,

a first electrode connection pattern formed of a second metal layer, the first electrode connection pattern configured to overlap the plurality of divided metal patterns with a buffer layer interposed therebetween and having first connection parts provided in regions between the plurality of divided metal patterns, and

a transparent electrode connection pattern configured to overlap the first electrode connection pattern with an interlayer insulating film interposed therebetween, the transparent electrode connection pattern formed of a transparent electrode and having second connection parts provided in regions between the plurality of divided metal patterns non-overlapping the first connection parts.

9. The display device according to claim 8, further comprising a pull-up transistor and a pull-down transistor arranged in series at one end of each of the plurality of first lines, on the at least one side of the non-display area,

wherein the end of each of the plurality of first lines is connected between the pull-up transistor and the pull-down transistor, and

wherein the storage capacitor is connected to a gate electrode of the pull-up transistor and the end of each of the plurality of first lines.

10. The display device according to claim 8, further comprising first electrode contact patterns formed of the second metal layer to be spaced apart from the first electrode connection pattern, the first electrode contact patterns configured to overlap at least two adjacent divided metal patterns.

11. The display device according to claim 10, wherein the transparent electrode connection pattern overlaps the first electrode contact patterns.

12. The display device according to claim 10, wherein the first electrode contact patterns pass between the at least two adjacent divided metal patterns.

13. The display device according to claim 8, wherein at least one of the first connection parts and the second connection parts are used for laser cutting parts in a repair process.

14. The display device according to claim 8, further comprising, in each of the plurality of subpixels in the active area:

a light shielding wiring in a same layer as the plurality of the divided metal patterns formed of the first metal layer;

at least a pixel thin film transistor having a gate electrode, a source electrode, and a drain electrode in a same layer as the first electrode connection pattern formed of the second metal layer; and

a pixel electrode formed in a same layer as the transparent electrode connection pattern.

15. The display device according to claim 14, further comprising an organic light emitting layer and a common electrode sequentially stacked on the pixel electrode, in each of the subpixels in the active area.

16. The display device according to claim 8, wherein the plurality of first lines and the plurality of second lines are formed in a same layer as the second metal layer.

17. The display device according to claim 16, wherein one of the first line and the second line in each subpixel is divided into a first pattern and a second pattern such that the first pattern and the second pattern are spaced apart from the other of the first line and the second line.

18. The display device according to claim 17, further comprising a third pattern formed of the first metal layer or the transparent electrode, the third pattern configured to overlap and connect adjacent portions of the first pattern and the second pattern.

19. A method for manufacturing a display device comprising a storage capacitor, the method comprising:

preparing a substrate having an active area having a plurality of subpixels provided therein and a non-display area outside the active area;

forming a plurality of divided metal patterns of a first metal layer and spaced apart from one another, on at least one side of the non-display area;

forming a buffer layer having first contact holes configured to expose parts of at least two adjacent divided metal patterns, on the substrate;

depositing a second metal layer on the buffer layer and then selectively removing the second metal layer to form first electrode contact patterns by connecting two adjacent divided metal patterns through the first contact holes, and a first electrode connection pattern spaced apart from the first electrode contact patterns to overlap the plurality of divided metal patterns, the first electrode connection pattern having first connection parts provided in regions between the plurality of divided metal patterns;

forming an interlayer insulting film having second contact holes configured to overlap the first electrode contact patterns; and

depositing a transparent metal on the interlayer insulating film and then selectively removing the transparent metal to form a transparent electrode connection pattern connected to the first electrode contact patterns through the second contact holes, wherein second connection parts are provided in regions between the plurality of divided metal patterns non-overlapping the first connection parts, the second connection parts configured to overlap the plurality of divided metal patterns.